Results 231 to 240 of about 1,887,037 (257)

Planetary Nebulae with H2 Emission

, 2003
Lorena Arias, Margarita Rosado
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A WC/WO star exploding within an expanding carbon–oxygen–neon nebula

Nature, 2021
The final fate of massive stars, and the nature of the compact remnants they leave behind (black holes and neutron stars), are open questions in astrophysics. Many massive stars are stripped of their outer hydrogen envelopes as they evolve.
A. Gal-Yam, R. Bruch, S. Schulze, Y. Yang, D. Perley, I. Irani, J. Sollerman, E. Kool, M. Soumagnac, O. Yaron, N. Strotjohann, E. Zimmerman, C. Barbarino, S. Kulkarni, M. Kasliwal, K. De, Y. Yao, C. Fremling, L. Yan, E. Ofek, C. Fransson, A. Filippenko, W. Zheng, T. Brink, C. Copperwheat, R. Foley, J. Brown, M. Siebert, G. Leloudas, A. Cabrera-Lavers, D. García-Álvarez, A. Marante-Barreto, S. Frederick, T. Hung, J. Wheeler, J. Vinkó, B. Thomas, M. Graham, D. Duev, A. Drake, R. Dekany, E. Bellm, B. Rusholme, D. Shupe, I. Andreoni, Y. Sharma, R. Riddle, J. V. Roestel, N. Weizmann, Okc, Berkeley, Ljmu, Lbl Caltech, Miller Institute, Ucsc, Dtu, Gtc, Umd, U. Austin, Konokly, Szeged, Eotvos, Uw, Ipac, Belgrade   +64 more
semanticscholar   +1 more source

Visualizing Stars and Emission Nebulas

Computer Graphics Forum, 2001
We describe star and nebula visualization techniques used to create a 3D volumetric visualization of the Orion Nebula. The nebula's ionization layer is modeled first as a surface model, derived from infrared and visible light observations. The surface model is imported into a volume scene graph‐based visualization system that uses procedural volume ...
David R. Nadeau, Jon D. Genetti, Steve Napear, Bernard Pailthorpe, Carter Emmart, Erik Wesselak, Dennis Davidson   +6 more
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Infrared Emission from Reflection Nebulae

Symposium - International Astronomical Union, 1989
Observations of 1–25 μm. continuum emission and the interstellar infrared emission features in reflection nebulae are reviewed. These observations place important constraints on models of very small grains or large molecules such as PAHs, which these models must address in order to understand this fundamental component of interstellar dust.
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Emission nebulae in NGC 4449

Publications of the Astronomical Society of the Pacific, 1979
Two hundred and fifty-two H II regions have been identified in NGC 4449 and positions in rectangular coordinates are given. The size-frequency relation is compared with that of M33, NGC 2403, NGC 628, NGC 3631, and NGC 6822. Very sharp and faint filaments radially arranged with respect to the main body of the galaxy have been identified.
F. Sabbadin, A. Bianchini
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Infrared Emission from Young Planetary Nebulae

1987
Measurements of planetary nebulae in the far infrared, especially from IRAS, are presented and discussed. The dust temperature and intrinsic luminosity are found to vary as the nebula evolves. The source of energy which heats the dust is discussed and it is shown that heating by nebular Lyman α is usually insufficient, especially in young nebulae.
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Radio Emission of Planetary Nebulae

1997
A planetary nebula, is essentially a cloud of strongly ionized gas, and so the emission at radio frequencies should be inevitable. Continuous radio emission should be excited mainly by free—free transitions of electrons in the Coulomb field of charged particles. In this case, the total energy emitted at radio frequencies is proportional to ∫ n e 2 dV ~
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Carbon monoxide emission from young planetary nebulae

International Astronomical Union Colloquium, 1989
We have mapped the CO J=2-l and J=l-0 emission with high angular resolution (about 10” and 20”, respectively) from the young planetary nebulae NGC2346, M2-9 and NGC6720 (the Ring nebula in Lyra). The observations were carried out by using the IRAM 30-m dish at Pico Veleta (near Granada, Spain).
R. Bachiller, V. Bujarrabal, J. Martín-Pintado, P. Planesas, J. Gómez-González   +4 more
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Emission-line Central Stars of Planetary Nebulae

AIP Conference Proceedings, 2005
The temperatures of central stars of planetary nebulae (PNe) are compared with evolutionary tracks. © 2005 American Institute of Physics.
Gesicki, K., Zijlstra, A. A., Acker, A.
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Photometry Of Galactic Emission Nebulae.

1955
PhD ; Astronomy ; Astrophysics ; University of Michigan, Horace H. Rackham School of Graduate Studies ; http://deepblue.lib.umich.edu/bitstream/2027.42/181402/2/0011249 ...
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